Time and Frequency Synchronization Method, Network Device and Terminal

4. The time-and-frequency synchronization method according to claim 3, wherein the sequence of the physical signal is one of a Gold sequence, an m sequence, Zadoff-chu (ZC) sequence and a Computer Generated Sequence (CGS).

9. The time-and-frequency synchronization method according to claim 1, wherein the configuration information comprises a time-frequency resource position of the physical signal, and the time-frequency resource position comprises at least one of a time-frequency resource position occupied by the physical signal within an occupied radio frame and or a time-frequency resource occupied by the physical signal within an occupied slot.

11. The time-and-frequency synchronization method according to claim 10, wherein T1 or T2 is predefined, or configured by the network device.

18. A network device, comprising a processor, a memory, and a program stored in the memory and executed by the processor, wherein the processor is configured to execute the program so as to implement the time-and-frequency synchronization method according to claim 15.